TY - JOUR
T1 - Approximations to energy and temperature dissipation rates in the far field of a cylinder wake
AU - Hao, Z.
AU - Zhou, Tongming
AU - Chua, L.P.
AU - Yu, S.C.M.
PY - 2008
Y1 - 2008
N2 - Approximations to energy and temperature dissipation rates, denoted as εap and χap, are obtained using a probe consisting of four hot wires and a pair of parallel cold wires. The performance of the probe in measuring velocity and temperature derivatives and vorticity has been checked satisfactorily by comparing with isotropic calculations. Local isotropy across the wake is examined. The results show that in the region of x2/L 1, local isotropy is approximately satisfied. When x2/L further increases, the departure from local isotropy becomes apparent. The differences between the present approximations of the two dissipation rates and those obtained by using isotropic relations are discussed in terms of their corresponding spectra and the correlation coefficient with respect to different longitudinal separations r. The correlations between the two dissipation fields and the enstrophy are also examined. Whereas εap is strongly correlated with , the correlation between and χap is small.
AB - Approximations to energy and temperature dissipation rates, denoted as εap and χap, are obtained using a probe consisting of four hot wires and a pair of parallel cold wires. The performance of the probe in measuring velocity and temperature derivatives and vorticity has been checked satisfactorily by comparing with isotropic calculations. Local isotropy across the wake is examined. The results show that in the region of x2/L 1, local isotropy is approximately satisfied. When x2/L further increases, the departure from local isotropy becomes apparent. The differences between the present approximations of the two dissipation rates and those obtained by using isotropic relations are discussed in terms of their corresponding spectra and the correlation coefficient with respect to different longitudinal separations r. The correlations between the two dissipation fields and the enstrophy are also examined. Whereas εap is strongly correlated with , the correlation between and χap is small.
U2 - 10.1016/j.expthermflusci.2005.08.008
DO - 10.1016/j.expthermflusci.2005.08.008
M3 - Article
SN - 0894-1777
VL - 32
SP - 791
EP - 799
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
IS - 3
ER -